01 — Technical practice · Cuiabá — MT
Concretetechnology,Portland cement.
Mix design, technical control and quality management. The practice of Olivio Fiorese Neto, a civil engineer in Cuiabá — professor at UFMT and technical director of Ibracon-MT.
02 — What we do
Mix design, technical control, consulting and training.
From the mix to the control, with the materials on the job.
Concrete mix design
Proportioning for the consistency, strength and durability the specification asks for, using the materials the project actually has.
See the scope 02Technical control and quality management
Following the concrete through production and acceptance, with a record of what was ordered and what arrived.
See the scope 03Consulting and technical opinions
A reading of a concrete problem: a mix that will not close, a result that does not match, a crack, durability, or a specification.
See the scope 04Training
Classes and workshops for site, laboratory and placing crews, inside concrete technology.
See the scope03 — The practice
The brand of someone who works concrete.
Concreto.tec.br is the main brand and the business home of Olivio Fiorese Neto. Portland-cement concrete technology — mix design and quality management — is the subject.
04 — Technical notebook
Short notes on durability, materials and the job site. Posts marked as examples are the seed of the notebook.
Reading for someone who would proportion the mix again.
Autogenous shrinkage: concrete can crack without losing water
In a low water–cement mix, hydration dries the paste from the inside. That shrinkage does not require loss to the surroundings; external curing stays mandatory, and Jensen and Hansen (2001) propose internal curing with SAP.
Read the articleCarbonation: service life is not settled by fck alone
CO2 from the air lowers the pH of the cover until the steel is depassivated. Possan's 2010 model estimates the front and the service life from job-site variables, and NBR 6118 leaves the specification to the aggressiveness class.
Read the articleLC3: the bottleneck is characterizing the clay
What LC3-50 is, why reactivity depends on the kaolinite content of the clay, and what to measure before treating the 50/30/15/5 recipe as the cement of the job.
Read the articleC-S-H nucleation seeding: accelerating low-clinker cement past the first day
Why low-clinker cement gains strength slowly, how a C-S-H seed changes nucleation, what slag does to later strength, and why the number of nuclei matters more than the mass added.
Read the articleAlkali-silica reaction: why silica-rich SCMs hold the alkalis
What ASR is, how silica fume, metakaolin, fly ash and slag mitigate it through a low Ca/Si C-S-H, why there is no universal replacement level, and how NBR 15577 requires the mitigation to be proved with the cement and the SCM of the job.
Read the article ExampleClay in the sand and PCE admixture: why the slump disappears
Sand carrying clay, especially smectite, binds polycarboxylate superplasticizer. Slump vanishes, and making it up with water is a different concrete.
Read the article ExampleDelayed ettringite formation: the heat that becomes a crack years later
Why a temperature peak in mass concrete can plant ettringite that only expands once the concrete is hard — and what mix design and thermal control have to do with it.
Read the articleContact
A concrete problem needs a technical reading, not a guessed mix.
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